code: def test_enum_is_in_series_non_existent() -> None:
      dtype = pl.Enum(["a", "b", "c"])
      s = pl.Series(["a", "b", "c", None], dtype=dtype)
      s2_str = pl.Series(["a", "d", "e"])
      expected = pl.Series([True, False, False, None])
      assert_series_equal(s.is_in(s2_str), expected)
  
imports: from __future__ import annotations
  from datetime import date
  import pytest
  import polars
  from polars import StringCache
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 21 for calling a global function with example usage: test_enum_is_in_series_non_existent() without return types